Um, wouldn't simply using two fires solve the problem? Assuming you actually need that much cooking space it stands to reason you'll have to use more fuel - any particular reason why the fire has to be all one mass?

Also, shouldn't a barrel shape result in a downward flow as hot air from the fire is displaced by more hot air and forced to follow the curvature of the vault? It would seem that lengthening the fire base (longer rather than round) could lessen the volume of cold spots by utilizing the barrel shape.

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